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		</style></HEAD><hr><div style="padding-left:4px;border-left:solid black 1px;border-top:solid black 1px;border-bottom:solid black 2px;border-right:solid black 2px;background-color:#deaa87;font-family:courier new;font-size:16pt;">Class <a class="no" name="_C_FUNCGENERATOR"><b>FuncGenerator</b></a></div>
<i>(Defined in: jpgraph_utils.inc.php : 17)</i><br>&nbsp;<br><table cellspaceing=0 cellpadding=4 style="border:solid #303030 1px;"><tr><td align="center" style="background:lightgray;" >&nbsp;<a href="FuncGenerator.html" style="font-family:arial;font-weight:bold;color:darkblue;">FuncGenerator</a>&nbsp;</td></tr><tr><td valign=top>&nbsp;<a href="FuncGenerator.html#_FUNCGENERATOR_E">E()</a>&nbsp;<br>
&nbsp;<a href="FuncGenerator.html#_FUNCGENERATOR___CONSTRUCT">__construct()</a>&nbsp;<br>
</td></tr></table>&nbsp;<p><div style="font-weight:bold;font-family:arial;font-size:100%;">Class usage and Overview</div>A utility class to help with function plots. This class supprots both ordinary one-variable plots with one dependent variable as well as polar plots.

Basically you create an instance of this class with the function you want to plot as a string argument. The function should be created using 'x' as the independent variable. You then invoke its evaluation method 'E()' with the range for the independent variable and possibly a step size. The method then returns an array of X, and Y values that represents the plot.

Please remember that the string should be specified with single quotes since otherwise PHP will try to interpret the variable in the string.

For example, to specify a simple cos() plot you specify:

$f = new FuncGenerator('cos($x)';
 <p> &nbsp;
<hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p>
<p> &nbsp; <div style='font-family: helvetica, arial, geneva, sans-serif;margin-bottom:4px;border-left:solid black 1px;border-top:solid black 1px;border-bottom:solid black 2px;border-right:solid black 2px;font-size:120%;background:#dde9af;padding:4px;'><a class="no" name="_FUNCGENERATOR_E"><span style="color:#555555;">FuncGenerator ::</span><br><b>E</b>($aXMin, $aXMax, $aSteps)</a></div>

<span style='font-family:arial;font-size:95%;'><i>Evaluate a X-Y function</i></span><p>

<table cellspacing=0 style='border:black solid 1pt;' width=100%>
<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'><span style="color: #000000">
<span style="color: #0000BB">$aXMin</span>
</span>

</td><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'>&nbsp;</td><td>Min x-value</td></tr>

<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'><span style="color: #000000">
<span style="color: #0000BB">$aXMax</span>
</span>

</td><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'>&nbsp;</td><td>Max x-value</td></tr>

<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'><span style="color: #000000">
<span style="color: #0000BB">$aSteps</span>
</span>

</td><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'><span style="color: #000000">
<span style="color: #0000BB">50</span>
</span>
</td><td>Number of steps</td></tr>
</table>

<div style="font-weight:bold;font-family:arial;font-size:90%;">Description:</div>Evaluate the previous specified function between the specified values. The return two arrays representing the X and Y coordinates for the function.&nbsp;<br>

<div style="font-weight:bold;font-family:arial;font-size:90%;"><p>Example:</div><div style="padding:5px;border:dashed gray 1px;background-color:#f3f3f3;font-family:courier new;font-size:90%;font-weight:bold;"><b><span style="color: #000000">
<span style="color: #0000BB"></span><span style="color: #FF8000">//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;linear&nbsp;plot<br /></span><span style="color: #0000BB">$f&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">FuncGenerator</span><span style="color: #007700">(</span><span style="color: #DD0000">'cos($x)&nbsp;*&nbsp;sin($x)'</span><span style="color: #007700">);<br />list(</span><span style="color: #0000BB">$xdata</span><span style="color: #007700">,</span><span style="color: #0000BB">$ydata</span><span style="color: #007700">)&nbsp;=&nbsp;</span><span style="color: #0000BB">$f</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">E</span><span style="color: #007700">(-</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$lp1&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">LinePlot</span><span style="color: #007700">(</span><span style="color: #0000BB">$ydata</span><span style="color: #007700">,</span><span style="color: #0000BB">$xdata</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;polar&nbsp;plot&nbsp;(a&nbsp;circle)<br /></span><span style="color: #0000BB">$p&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">FuncGenerator</span><span style="color: #007700">(</span><span style="color: #DD0000">'cos($i)'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'sin($i)'</span><span style="color: #007700">);<br />list(</span><span style="color: #0000BB">$x2data</span><span style="color: #007700">,</span><span style="color: #0000BB">$y2data</span><span style="color: #007700">)&nbsp;=&nbsp;</span><span style="color: #0000BB">$f</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">E</span><span style="color: #007700">(-</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$lp2&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">LinePlot</span><span style="color: #007700">(</span><span style="color: #0000BB">$y2data</span><span style="color: #007700">,</span><span style="color: #0000BB">$x2data</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//...</span><span style="color: #0000BB"></span>
</span>
</b></div><br>
<p>
<p> &nbsp; <div style='font-family: helvetica, arial, geneva, sans-serif;margin-bottom:4px;border-left:solid black 1px;border-top:solid black 1px;border-bottom:solid black 2px;border-right:solid black 2px;font-size:120%;background:#dde9af;padding:4px;'><a class="no" name="_FUNCGENERATOR___CONSTRUCT"><span style="color:#555555;">FuncGenerator ::</span><br><b>__construct</b>($aFunc, $aXFunc)</a></div>

<span style='font-family:arial;font-size:95%;'><i>Create a new function generator.</i></span><p>

<table cellspacing=0 style='border:black solid 1pt;' width=100%>
<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'><span style="color: #000000">
<span style="color: #0000BB">$aFunc</span>
</span>

</td><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'>&nbsp;</td><td>Function</td></tr>

<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'><span style="color: #000000">
<span style="color: #0000BB">$aXFunc</span>
</span>

</td><td style='border-right:black solid 1pt;font-family:courier;font-size:100%;font-weight:bold;'><span style="color: #000000">
<span style="color: #0000BB"></span><span style="color: #DD0000">''</span><span style="color: #0000BB"></span>
</span>
</td><td>X-Function</td></tr>
</table>

<div style="font-weight:bold;font-family:arial;font-size:90%;">Description:</div>Creates a new funciton generator. You can create both a linear plot as well as polar plot.

For linear, one-variable plots, you must use '$x' as the independent variable.

For polar plots you should use the index '$i' for the generating functions.
&nbsp;<br>

<div style="font-weight:bold;font-family:arial;font-size:90%;"><p>Example:</div><div style="padding:5px;border:dashed gray 1px;background-color:#f3f3f3;font-family:courier new;font-size:90%;font-weight:bold;"><b><span style="color: #000000">
<span style="color: #0000BB"></span><span style="color: #FF8000">//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;linear&nbsp;plot<br /></span><span style="color: #0000BB">$f&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">FuncGenerator</span><span style="color: #007700">(</span><span style="color: #DD0000">'cos($x)&nbsp;*&nbsp;sin($x)'</span><span style="color: #007700">);<br />list(</span><span style="color: #0000BB">$xdata</span><span style="color: #007700">,</span><span style="color: #0000BB">$ydata</span><span style="color: #007700">)&nbsp;=&nbsp;</span><span style="color: #0000BB">$f</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">E</span><span style="color: #007700">(-</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$lp1&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">LinePlot</span><span style="color: #007700">(</span><span style="color: #0000BB">$ydata</span><span style="color: #007700">,</span><span style="color: #0000BB">$xdata</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;polar&nbsp;plot&nbsp;(a&nbsp;circle)<br /></span><span style="color: #0000BB">$p&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">FuncGenerator</span><span style="color: #007700">(</span><span style="color: #DD0000">'cos($i)'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'sin($i)'</span><span style="color: #007700">);<br />list(</span><span style="color: #0000BB">$x2data</span><span style="color: #007700">,</span><span style="color: #0000BB">$y2data</span><span style="color: #007700">)&nbsp;=&nbsp;</span><span style="color: #0000BB">$f</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">E</span><span style="color: #007700">(-</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">*</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$lp2&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">LinePlot</span><span style="color: #007700">(</span><span style="color: #0000BB">$y2data</span><span style="color: #007700">,</span><span style="color: #0000BB">$x2data</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//...<br /></span><span style="color: #0000BB"></span>
</span>
</b></div><br>
<p> <hr> <p></html>